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Consolidated Statements of Cash Flows - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CASH FLOWS FROM OPERATIONAL ACTIVITIES      
NET INCOME R$ 1,444,004 R$ 1,118,255 R$ 874,472
Adjustments to reconcile net income for the period with cash generated from operating activities      
Unrealized monetary and cambial variation and debt charges - net 767,751 900,610 1,171,228
Interest - bonus from the grant of concession agreements under the quota system (85,986) (82,160) (96,783)
Gain on transmission concession agreement (268,904) (129,769) (98,780)
Reversal of estimated losses on transmission concession agreement 0 0 (29,025)
Gain on remeasurement of the cash flow from the RBSE assets (82,640) (361,156) (809,639)
Result of the adoption of the Special Tax Regularization Program 0 (154,197) 0
Income tax and social contribution 580,065 379,943 589,322
Deferred income tax and social contribution (68,072) (105,257) (69,632)
Equity in earnings of investees (135,888) (101,739) (166,411)
Result of renegotiation of hydrological risk - GSF 0 0 (26,872)
Appropriation of actuarial calculation of post-employment benefits 97,900 97,511 130,707
Appropriation of pension and healthcare contributions 151,215 153,069 142,735
Creation for research and development and energy efficiency programs 125,369 118,753 101,946
Recognition of fair value of accounts receivable related to concession (47,499) (57,080) (132,741)
Sectorial financial assets and liabilities result (985,344) (767,040) 1,079,662
Depreciation and amortization 749,179 731,599 708,296
Net operating estimated losses, provisions and reversals 306,697 365,539 768,696
Result from the change of the investment valuation method 0 0 (52,107)
Losses in the business combination 3,769 0 0
Result of disposal of investment (8,174) (28,650) 0
Fair value in the purchase and sale of power in the active market (3,786) 0 0
Impairment of accounts receivable related to concession 1,536 17 54
Loss on disposal of contract assets 9,762 0 0
Loss on disposal of property, plant and equipment 68,450 64,508 27,316
Loss on disposal of intangible assets 28,742 42,740 47,434
Total 2,648,146 2,185,496 4,159,878
Decrease (increase) in assets      
Trade accounts receivable 191,113 (322,814) 578,116
Dividends and interest on own capital received 50,858 44,334 154,877
CRC transferred to the Government of the State of Paraná 260,117 97,085 49,425
Judicial deposits 87,853 96,028 62,324
Sectorial financial assets 482,974 0 258,779
Other receivables 17,292 (44,193) 15,244
Inventories (5,726) 20,078 381
Income tax and social contribution 360,855 146,602 (69,989)
Other current taxes recoverable (74,003) 87,884 (25,608)
Prepaid expenses 8,520 12,128 10,096
Related Parties 0 (667) 0
Total decrease (increase) in assets 1,379,853 136,465 1,033,645
Increase (decrease) in liabilities      
Payroll, social charges and accruals (29,845) 26,170 29,396
Related parties (59) 0 0
Suppliers (572,306) 275,370 (666,864)
Other taxes 75,234 24,795 (62,239)
Post-employment benefits (204,809) (200,848) (187,143)
Sectorial charges due (70,507) 8,313 (135,746)
Research and development and energy efficiency (91,015) (104,512) (58,831)
Payable related to the concession (64,365) (65,871) (648,593)
Sectorial financial liabilities 0 419,220 0
Other accounts payable 103,464 (101,062) (23,605)
Provisions for legal claims (144,171) (124,395) (193,197)
Total increase (decrease) in liabilities (998,379) 157,180 (1,946,822)
CASH GENERATED BY OPERATING ACTIVITIES 3,029,620 2,479,141 3,246,701
Income tax and social contribution paid (468,552) (335,087) (859,784)
Loans and financing - interest due and paid (289,095) (532,033) (362,128)
Debentures - interest due and paid (501,002) (622,815) (547,971)
NET CASH GENERATED FROM OPERATING ACTIVITIES 1,770,971 989,206 1,476,818
CASH FLOWS FROM INVESTMENT ACTIVITIES      
Financial investments (75,804) 48,512 13,664
Loans and financing granted to related parties 0 (5,145) (9,422)
Receipt of loans and financing granted to related parties 117,645 24,985 5,112
Additions to contract assets (792,835) 0 0
Customers contributions - contract assets 106,764 0 0
Acquisitions of subsidiaries - effect on cash 7,998 0 0
Disposal of investments 0 484,608 0
Additions in investments (51,557) (248,243) (505,098)
Capital reduction of investees 35,280 0 74,983
Additions to property, plant and equipment (1,489,067) (1,205,508) (1,284,436)
Customers contributions - property, plant and equipment 12 0 40
Additions to intangible assets (7,589) (806,240) (928,727)
Customers contributions - intangible assets 0 125,858 122,809
NET CASH (USED IN) GENERATED FROM INVESTING ACTIVITIES (2,149,153) (1,581,173) (2,511,075)
CASH FLOWS FROM FINANCING ACTIVITIES      
Loans and financing obtained from third parties 1,314,766 800,044 93,806
Issue of Debentures 2,890,283 2,242,521 1,822,965
Payments of principal - loans and financing (1,126,144) (971,187) (226,973)
Payments of principal - debentures (1,491,667) (915,005) (785,239)
Dividends and interest on own capital paid (300,722) (506,404) (368,956)
NET CASH GENERATED FROM FINANCING ACTIVITIES 1,286,516 649,969 535,603
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS 908,334 58,002 (498,654)
Cash and cash equivalents at the beginning of the period 1,040,075 982,073 1,480,727
Cash and cash equivalents at the end of the period 1,948,409 1,040,075 982,073
CHANGE IN CASH AND CASH EQUIVALENTS R$ 908,334 R$ 58,002 R$ (498,654)